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Stainless Steel Header - 4QH99400H

  • Part #:
    446478
  • Mfg Part #:
    4QH99400H
  • OEM/Ref#:
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Stainless Steel Header - 4QH99400H

  • Part #:
    446478
  • Mfg Part #:
    4QH99400H
  • OEM/Ref#:
Price: $288.71
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Pro Circuit Stainless Steel Header - 4QH99400H
Owned and operated by Mitch Payton, Pro Circuit is a custom precision engine and suspension building facility. Pro Circuit's owner has invested over 25 years in engine building and machine shop techniques
  • Stainless steel head pipes are specially designed to improve performance when compared to stock head pipes
  • Built from 304 stainless steel to ensure maximum durability and corrosion resistance

    Notes:
    Rejetting is recommended when using this headpipe

    Exhaust discoloration (blueing) is caused by engine conditions such as cam timing, fuel-air mixture, operating temperature, etc. It is not the result of defective manufacturing, therefore it is not covered by any warranty. See the Chems/Lubes section for products to help remove or prevent exhaust discoloration.
Specifications
Part #: 446478
Mfg #: 4QH99400H
Color - Primary Silver
Type Head Pipe
Units Each
Weight 3.31 lbs
Alternate/OEM Part Number(s):
4QH99400H
Fitment for Pro Circuit Stainless Steel Header - 4QH99400H

Part 446478 fits the following machines

Honda
  • TRX400EX 2006-2008
  • TRX400EX FourTrax 1999-2000
  • TRX400EX Sportrax 2001-2005
  • TRX400X 2009, 2012-2014
Reviews & Questions
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4.3 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
1
3
0
0
0
Finish
4.5 / 5
Fit
4.5 / 5
Performance
5.0 / 5
Quality
4.5 / 5
Style
3.5 / 5
Value
4.5 / 5
Fit
5 / 5
Quality
5 / 5
Style
3 / 5
Value
5 / 5
Better performance than stock and much cheaper.
I had to replace the header on my 450 due to damage to the stocker. This one was much cheaper than replacing with OEM and I saw increased performance over the stocer (in it's pre-damaged condition).
January 21, 2010
St. Paul, MN
Finish
4 / 5
Performance
5 / 5
Good Header
The original header flange was way too thick to use the drz400 header bolts so I had to take the flange off of the stock pipe and slightly modify it to be used with the new header. Was a little hard to get it to bolt up to a Yoshi slip-on too but I was expecting that. Overall it's a great mod for the price, I could feel the bike gained some mid range and top end power.
May 8, 2012
Finish
5 / 5
Performance
5 / 5
Worked for me.
had to replace stock header on my 06 crf250x, I was a little concerned about it fitting as my local dealer told me it probably wouldn't. I phoned Dennis Kirk and they confirmed with their tech that it would fit and when it came I had no problems installing. I also saved a reasonable amount of money buying thru Dennis Kirk , which was key in making the purchase in the first place.
March 27, 2012
Fit
4 / 5
Quality
4 / 5
Style
4 / 5
Value
4 / 5
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September 9, 2010